Architects Tod Williams and Billie Tsien have won the long-running competition to design the Obama Presidential Library in Chicago.
Announced by the Barack Obama Foundation today, the New York-based firm will partner with local practice Interactive Design Architects (IDEA) to create a cultural venue in commemoration of the 44th US president's term of office.
"TWBTA stood out in their commitment to explore the best ways of creating an innovative centre for action that inspires communities and individuals to take on our biggest challenges," said the foundation.

Related story: Tod Williams and Billie Tsien complete sheltered ice skating rink in Brooklyn

The building, estimated to cost more than $500 million (£380 million) and expected to complete in 2021, will include a library containing Obama's presidential archives and a museum dedicated to his presidency. The project will be funded by private donations. It will be located in Chicago's South Side, where first lady Michelle Obama was born and raised and where her husband was first elected to public office.
"This has been a transformative presidency and we will work to make a centre that embodies and expands the Obamas' vision," said Williams and Tsien. "We look forward to collaborating with our partners, Interactive Design Architects, and to working with the South Side community."
Williams and Tsien's 2001 American Folk Art Museum was controversially demolished just 13 years after c...